The Collaborative International Dictionary of English v.0.48:

Sufficiently \Suf*fi"cient*ly\, adv.
   To a sufficient degree; to a degree that answers the purpose,
   or gives content; enough; as, we are sufficiently supplied
   with food; a man sufficiently qualified for the discharge of
   his official duties.
   [1913 Webster]

WordNet (r) 3.0 (2006):

sufficiently
    adv 1: to a sufficient degree; "she was sufficiently fluent in
           Mandarin" [ant: insufficiently]